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《Journal of Ecology and Rural Environment》 2012-06
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Tracing Nitrate Sources of the Yellow River and Its Tributaries With Nitrogen Isotope

ZHANG Dong1,2,YANG Wei1,ZHAO Jian-Li3(1.School of Resource and Environment,Henan Polytechnic University,Jiaozuo 454000,China;2.State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,China;3.Qinyuan Service Center,Environmental Protection Agency of Jiyuan City,Jiyuan 454600,China)  
Human activities have greatly affected the nitrogen(N) cycles in the terrestrial and aquatic ecosystems.The Xiaolangdi Reservoir on the Yellow River and the mainstream and tributaries of the River thereafter,including Qin River and Yiluo River,were selected as subjects in this study to trace potential nitrate sources of the waters with nitrogen isotope.It was found that the average nitrate content in the mainstream of the Yellow Rvier and its tributaries,Qin River and Yiluo River,was(4.77±0.95) mg·L-1,(3.45±1.71) mg·L-1 and(4.50±0.91) mg·L-1,respectively;and the average δ15N-NO-3 in the mainstream was(+3.2±4.5)‰.Dissolved nitrate in upper stream of the Yellow River in the studied area came mainly from mineralized soil organic nitrogen,and in the rivers of the lower reaches from mineralized soil organic nitrogen and fertilizers applied.The average δ15N-NO-3 was(+8.3±4.6)‰ in the Qin River.Its nitrate came mainly from atmospheric precipitation,mineralized soil organic nitrogen and fertilizers during the high water season,and from sewage water and mineralized soil organic nitrogen during the normal water season,and from growth of phytoplankton and cyanobacteria,and denitrification in enclosed waters formed after the river discontiunued its flow during the low water season.Druing the low water season,the average δ15N-NO-3 was +10.9‰ and +3.4‰ in the Luo River and the Yi River respectively.In the former,sewage was the main source of nitrate,while in the latter the fertilizers.
【Fund】: 国家自然科学基金(41103053);; 中国煤炭工业协会2010年度科学技术研究指导性计划项目(MTKJ2010-367)
【CateGory Index】: P342
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